1002020221 has 16 divisors (see below), whose sum is σ = 1033013248. Its totient is φ = 971611200.

The previous prime is 1002020191. The next prime is 1002020249. The reversal of 1002020221 is 1220202001.

It is a cyclic number.

It is not a de Polignac number, because 1002020221 - 2¹⁷ = 1001889149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002020198 and 1002020207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002020251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1634311 + ... + 1634923.

It is an arithmetic number, because the mean of its divisors is an integer number (64563328).

Almost surely, 2^1002020221 is an apocalyptic number.

It is an amenable number.

1002020221 is a deficient number, since it is larger than the sum of its proper divisors (30993027).

1002020221 is a wasteful number, since it uses less digits than its factorization.

1002020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1002020221 is about 31654.7029839169. The cubic root of 1002020221 is about 1000.6729540313.

Adding to 1002020221 its reverse (1220202001), we get a palindrome (2222222222).

The spelling of 1002020221 in words is "one billion, two million, twenty thousand, two hundred twenty-one".